ASUS MAXIMUS VIII RANGER motherboard won't go over 3500MHz on RAM on certain DIMM slots

krYshuT

Prominent
May 2, 2017
17
0
510
So I got myself 2×8GB 3733MHz sticks and my ASUS MAXIMUS VIII RANGER just cannot get them to work properly. I always got a debug code 55.
I have it paired with an i7-7700K

First thing I tried of course was the XMP profile - didn't work, so I'm pissed as I knew this is gonna be a long day.
So I tried:
- Different memory multipliers. The highest I could go was RAM going on preset 3466MHz.
- Push the voltage and timings up and go there with BCLK overclocking. Whatever I did, change of different voltages, clocks, I was always stuck at about 3500MHz.
- Older BIOSes, the older one that is claiming "Improved DRAM XMP compatibility over 4200MHz." and others.
- Have just one stick installed in different slots.

The ONLY config I could get 3733MHz to work was in slot second closest to the CPU with just one stick single channel installed (both sticks were able to load the XMP profile there), slot 1/3/4 was getting that above debug code 55 or sometimes 49 looping with 01 or 03 codes.

I got a headache already, has anyone some ideas what could get my expensive sticks get the work on its intended clocks?
Thank you :)
 

Wizard61

Prominent
Jun 22, 2017
89
0
660
First off the motherboard only supports 3400 memory,

Second check this on your board - https://www.asus.com/us/support/FAQ/1015262/

Also, if you are only using 2 sticks of memory make sure that you are in the second and fourth slots, slot one is closest to the CPU.
 

krYshuT

Prominent
May 2, 2017
17
0
510


As I stated in my post:
- Yes, the MB supports frequencies over 4200M with newer BIOSes, 3400M is 2yo info
- Yes my DIMM #2 works at mine 3733M on both modules, even with XMP enabled, other slots can only do ~3500M
- No, the "EZ" or "MemOK" automated bullcrap does exactly nothing, it does set something resulting in same debug post codes as when I set it manually
 

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